Cannot start BPM process, "Start process" button is disabled: Why?

Dear all,
I am working on the BPM example "Modeling Your First Process with SAP NetWeaver Business Process Management" with the "Purchase process". I did everything as mentioned in the tutorial.
At the end, I would like to start the process using
NWA > Configuration management > Processes and Tasks > Process Repository
I can see my WD example that I have deployed and I see the my task definitions and my process definition. In the tutorial it says, that I can select the process definition and click "Start process". But the button "Start process" is always disabled. I cannot click the button. I don't know why. Did I miss something?
I am logged in as Administrator. I am using NW AS 7.2 and I am developing with NWDS 7.1 SP04.
Anyone has an idea what can I do to start the process?
Thanks in advance
Edited by: Patrick Beck on Jun 25, 2010 4:55 PM

Thanks for the link.
I added the new context attribute in the XSD files (under Process Modeling > Data Types > XSD Files).
Since I added a new context attribute "Comment" of type String in my Web Dynpro, I added the following on the corrent position of the XSD files:
                         <xsd:element name="Comment" type="com.sap.dictionary.string">
               <xsd:annotation>
                    <xsd:appinfo>
                         <xsd:attribute name="ReadOnly" type="xsd:boolean" fixed="false"/>
                                                                      </xsd:appinfo>
               </xsd:annotation>
          </xsd:element>
I also edited input and output mapping of the human and automated activities to support the new attribute "Comment". I thought this is enough to pass the new "Comment" parameter from activity to activity.
But when I started the process, I filled in the comment field in Web Dynpro and went to the next step in the process. Seems like the new attribute value for "Comment" got lost. It does not appear in the next process step.
Did I miss something?
These are the steps I did:
- edit Web Dynpro UI to support the new context attribute "Comment". created new input field and mapped to the Comment context attribute (that is defined in my WDP interface).
- edited XSD files (one for each human activity) to support the new Comment attribute as mentioned above.
- edited the mapping between the activities to support pass-through of the new Comment attribute between the activities
But it seems like it's not saved in the context attribute "Comment". It got lost after the first step.
Any ideas?

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